NAME¶

vm_page_protect — lower a page's protection

SYNOPSIS¶

#include <sys/param.h>
#include <vm/vm.h>
#include <vm/vm_page.h> void
vm_page_protect(vm_page_t mem, int prot);

DESCRIPTION¶

The vm_page_protect() function lowers a page's protection. The protection is never raised by this function; therefore, if the page is already at VM_PROT_NONE, the function does nothing. Its arguments are:

mem

The page whose protection is lowered.

prot

The protection the page should be reduced to. If VM_PROT_NONE is specified, then the PG_WRITABLE and PG_MAPPED flags are cleared and the pmap_page's protection is set to VM_PROT_NONE. If VM_PROT_READ is specified, then the PG_WRITABLE flag is cleared and the pmap_page's protection is set to VM_PROT_READ.

Higher protection requests are ignored.

AUTHORS¶

This manual page was written by Chad David ⟨davidc@acns.ab.ca⟩.